I have a strange situation:
when I use the keyboard as DAW only (setting in midi) and route it via ableton back to the matrixbrute, than there is a hughe delay on the master cutoff (you need to turn it very slowly to make it done)
When I use an external keyboard and I route these to the matrixbrute, I dont have this problem
ex. midi out: 16 --> ableton midi in --> ableton midi out --> midi in 15
in ableton you need to take MIDI (not audio)